First Appearance

Speculation

Known users

Real World References

The name originates from a famous Internet meme of the same name which means "Oh, really?". Orlies' exclaimations primarily feature similar phrases. On Page 114, Panel 2Erf-b1-p114, the Orlies hold a conversation in Leetspeak:
"Seriously." (SRSLY)
"Oh, really?" (ORLY)
"Hahaha... what?" (LOLWUT)